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U.S. retail sales grew 4.2 percent from $4.35 trillion in 2012, and online sales accounted for a significant portion of overall retail growth. E-commerce sales came in at $263.3 billion, up 16.9 percent, or $40 billion, in 2013 compared to 2012. While brick-and-mortar sales still make up the vast majority of the retail market, e-commerce sales are increasing much faster.

In 2013, mobile commerce, which includes products and services ordered on mobile devices, including tablets, increased 70 percent to reach $42.13 billion.

E-commerce sales will grow 15.5 percent this year to $304 billion, up from $263.3 billion in 2013. Mobile commerce will continue to soar, with an increase of 37.2 percent to $57.8 billion this year from $42.1 billion in 2013.

By 2017, eMarketer projects total U.S. retail sales of $5.55 trillion. That figure includes $491.5 billion of e-commerce sales and $132.69 billion in m-commerce sales.